Lithium ion batteries are currently divided into two categories: liquid lithium ion batteries (LIB) and polymer lithium ion batteries (PLB). Among them, liquid lithium-ion batteries refer to secondary batteries with Li+embedded compounds as positive and negative electrodes. Is the positive electrode made of lithium compound LiCoO? Or LiMn? O?, The negative electrode adopts lithium carbon interlayer compound. Lithium ion batteries are ideal energy sources for development in the 21st century due to their high working voltage, small size, light weight, high energy, no memory effect, no pollution, small self discharge, and long cycle life.

　　In 1992, Sony successfully developed lithium-ion batteries. Its practicality greatly reduces the weight and volume of portable electronic devices such as mobile phones and laptops. The usage time is greatly extended. Due to the absence of heavy metal cadmium in lithium-ion batteries, compared to nickel cadmium batteries, it greatly reduces environmental pollution.

　　There is still some pollution from lithium batteries.

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